Share-Based Compensation Expense Recorded in the Consolidated Statements of Operations (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 03, 2026	Jun. 27, 2025	Jul. 03, 2026	Jun. 27, 2025
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Share-based compensation expense	$ 9,836	$ 7,498	$ 19,632	$ 14,598
Location, Statement of Income, Balance [Axis]: us-gaap:CostOfGoodsAndServicesSold
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Share-based compensation expense	612	459	1,416	808
Location, Statement of Income, Balance [Axis]: us-gaap:ResearchAndDevelopmentExpense
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Share-based compensation expense	1,152	649	2,542	1,264
Location, Statement of Income, Balance [Axis]: us-gaap:SellingGeneralAndAdministrativeExpense
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Share-based compensation expense	7,491	$ 6,390	15,093	$ 12,526
Location, Statement of Income, Balance [Axis]: novt:RestructuringChargesAndAcquisitionRelatedCosts
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Share-based compensation expense	$ 581		$ 581